Qualcomm Technologies, Inc. GPU

Qualcomm Technologies, Inc. Adreno GPU

Required properties:
- label:		A string used as a descriptive name for the device.
- compatible:		Must be "qcom,kgsl-3d0" and "qcom,kgsl-3d"
- reg:			Specifies the register base address and size, the shader memory
			base address and size (if it exists), and the base address and size
			of the CX_DBGC block (if it exists).
- reg-names:		Resource names used for the physical address of device registers
			and shader memory. "kgsl_3d0_reg_memory" gives the physical address
			and length of device registers while "kgsl_3d0_shader_memory" gives
			physical address and length of device shader memory.  If
			specified, "qfprom_memory" gives the range for the efuse
			registers used for various configuration options. If specified,
			"kgsl_3d0_cx_dbgc_memory" gives the physical address and length
			of the CX DBGC block.
- interrupts:		Interrupt mapping for GPU IRQ.
- interrupt-names:	String property to describe the name of the interrupt.
- qcom,id:		An integer used as an identification number for the device.
- qcom,gpu-bimc-interface-clk-freq:
			GPU-BIMC interface clock needs to be set to this value for
			targets where B/W requirements does not meet GPU Turbo use cases.
- clocks:		List of phandle and clock specifier pairs, one pair
			for each clock input to the device.
- clock-names:		List of clock input name strings sorted in the same
			order as the clocks property.
				Current values of clock-names are:
				"src_clk", "core_clk", "iface_clk", "mem_clk", "mem_iface_clk",
				"alt_mem_iface_clk", "rbbmtimer_clk",  "alwayson_clk",
				"iref_clk", "l3_vote"
				"core_clk" and "iface_clk" are required and others are optional

- qcom,base-leakage-coefficient: Dynamic leakage coefficient.
- qcom,lm-limit:	Current limit for GPU limit management.
- qcom,isense-clk-on-level: below or equal this power level isense clock is at XO rate,
				above this powerlevel isense clock is at working frequency.

Bus Scaling Data:
- qcom,gpu-bus-table:		Defines a bus voting table with the below properties. Multiple sets of bus
				voting tables can be defined for given platform based on the type of ddr system.

Properties:
- compatible:			Must be "qcom,gpu-bus-table". Additionally, "qcom,gpu-bus-table-ddr" must also
				be provided, with the ddr type value(integer) appended to the string.
- qcom,msm-bus,name:		String property to describe the name of the 3D graphics processor.
- qcom,msm-bus,num-cases:	This is the the number of Bus Scaling use cases defined in the vectors property.
- qcom,msm-bus,active-only:	A boolean flag indicating if it is active only.
- qcom,msm-bus,num-paths: 	This represents the number of paths in each Bus Scaling Usecase.
- qcom,msm-bus,vectors-KBps:	A series of 4 cell properties, format of which is:
					<src dst ab ib>, <src dst ab ib>, // For Bus Scaling Usecase 1
					<src dst ab ib>, <src dst ab ib>, // For Bus Scaling Usecase 2
					<..  ..  .. ..>, <..  ..  .. ..>; // For Bus Scaling Usecase n
					This property is a series of all vectors for all Bus Scaling Usecases.
					Each set of vectors for each usecase describes bandwidth votes for a combination
					of src/dst ports.  The driver will set the desired use case based on the selected
					power level and the desired bandwidth vote will be registered for the port pairs.
				Current values of src are:
					0 = MSM_BUS_MASTER_GRAPHICS_3D
					1 = MSM_BUS_MASTER_GRAPHICS_3D_PORT1
					2 = MSM_BUS_MASTER_V_OCMEM_GFX3D
				Current values of dst are:
					0 = MSM_BUS_SLAVE_EBI_CH0
					1 = MSM_BUS_SLAVE_OCMEM
				ab: Represents aggregated bandwidth. This value is 0 for Graphics.
				ib: Represents instantaneous bandwidth. This value has a range <0 8000 MB/s>

- qcom,ocmem-bus-client: Container for another set of bus scaling properties
						qcom,msm-bus,name
						qcom,msm-bus,num-cases
						qcom,msm-bus,num-paths
						qcom,msm-bus,vectors-KBps
			to be used by ocmem msm bus scaling client.

- qcom,cpu-to-gpu-cfg-path: Container for another set of bus scaling properties
						qcom,msm-bus,name
						qcom,msm-bus,num-cases
						qcom,msm-bus,num-paths
						qcom,msm-bus,vectors-KBps
			to be used for keeping all clocks ON in CPU to GPU AHB config path.

GDSC Oxili Regulators:
- regulator-names:		List of regulator name strings sorted in power-on order
- vddcx-supply:			Phandle for vddcx regulator device node.
- vdd-supply:			Phandle for vdd regulator device node.

IOMMU Data:
- iommu:			Phandle for the KGSL IOMMU device node

GPU Power levels:
- qcom,gpu-pwrlevel-bins:	Container for sets of GPU power levels (see
				adreno-pwrlevels.txt)
DCVS Core info
- qcom,dcvs-core-info		Container for the DCVS core info (see
				dcvs-core-info.txt)

Optional Properties:
- qcom,initial-powerlevel: This value indicates which qcom,gpu-pwrlevel should be used at start time
			   and when coming back out of resume
- qcom,throttle-pwrlevel:  This value indicates which qcom,gpu-pwrlevel LM throttling
			   may start to occur
- qcom,bus-control:	   Boolean. Enables an independent bus vote from the gpu frequency
- qcom,bus-accesses:       Parameter for tuning bus dcvs.
- qcom,bus-accesses-ddrX:  Parameter for tuning bus dcvs for each DDR configuration where
                           X will be the return value from of_fdt_get_ddrtype().
- qcom,gpubw-dev:	   a phandle to a device representing bus bandwidth requirements
			   (see devdw.txt)
- qcom,idle-timeout:	   This property represents the time in milliseconds for idle timeout.
- qcom,no-nap:		   If it exists software clockgating will be disabled at boot time.
- qcom,chipid:		   If it exists this property is used to replace
			   the chip identification read from the GPU hardware.
			   This is used to override faulty hardware readings.
- qcom,disable-wake-on-touch:   Boolean. Disables the GPU power up on a touch input event.
- qcom,disable-busy-time-burst:
				Boolean. Disables the busy time burst to avoid switching
				of power level for large frames based on the busy time limit.

- qcom,pm-qos-active-latency:
				Right after GPU wakes up from sleep, driver votes for
				acceptable maximum latency to the pm-qos driver. This
				voting demands that the system can not go into any
				power save state *if* the latency to bring system back
				into active state is more than this value.
				Value is in microseconds.
- qcom,pm-qos-wakeup-latency:
				Similar to the above. Driver votes against deep low
				power modes right before GPU wakes up from sleep.
- qcom,l2pc-cpu-mask-latency:
				The CPU mask latency in microseconds to avoid L2PC
				on masked CPUs.

- qcom,force-32bit:
				Force the GPU to use 32 bit data sizes even if
				it is capable of doing 64 bit.

- qcom,gpu-speed-bin:      GPU speed bin information in the format
			   <offset mask shift>
				offset - offset of the efuse register from the base.
				mask   - mask for the relevant bits in the efuse register.
				shift  - number of bits to right shift to get the speed bin
				value.
- qcom,gpu-disable-fuse:	GPU disable fuse
				<offset mask shift>
				offset - offset of the efuse register from the base.
				mask   - mask for the relevant bits in the efuse register.
				shift  - number of bits to right shift to get the disable_gpu
				fuse bit value.

- qcom,soc-hw-rev-efuse:	SOC hardware revision fuse information in the format
				<offset bit_position mask>
				offset - offset of the efuse register from the base.
				bit_position - hardware revision starting bit in the efuse register.
				mask - mask for the relevant bits in the efuse register.

- qcom,highest-bank-bit:
				Specify the bit of the highest DDR bank. This
				is programmed into protected registers and also
				passed to the user as a property.
- qcom,min-access-length:
				Specify the minimum access length for the chip.
				Either 32 or 64 bytes.
				Based on the above options, program the appropriate bit into
				certain protected registers and also pass to the user as
				a property.
- qcom,ubwc-mode:
				Specify the ubwc mode for this chip.
				1: UBWC 1.0
				2: UBWC 2.0
				3: UBWC 3.0
				Based on the ubwc mode, program the appropriate bit into
				certain protected registers and also pass to the user as
				a property.
- qcom,l2pc-cpu-mask:
				Disables L2PC on masked CPUto the string.rendering thread is running on masked CPUs.
				Bit 0 is for CPU-0, bit 1 is for CPU-1...

- qcom,l2pc-update-queue:
				Disables L2PC on masked CPUs at queue time when it's true.

- qcom,snapshot-size:
				Specify the size of snapshot in bytes. This will override
				snapshot size defined in the driver code.

- qcom,enable-ca-jump:
                                Boolean. Enables use of context aware DCVS
- qcom,ca-busy-penalty:
                                This property represents the time in microseconds required to
                                initiate context aware power level jump.
- qcom,ca-target-pwrlevel:
                                This value indicates which qcom,gpu-pwrlevel to jump on in case
                                of context aware power level jump.

- qcom,gpu-qdss-stm:
				<baseAddr size>
				baseAddr - base address of the gpu channels in the qdss stm memory region
				size     - size of the gpu stm region

- qcom,gpu-qtimer:
				<baseAddr size>
				baseAddr - base address of the qtimer memory region
				size     - size of the qtimer region

- qcom,tsens-name:
				Specify the name of GPU temperature sensor. This name will be used
				to get the temperature from the thermal driver API.

- qcom,enable-midframe-timer:
				Boolean. Enables the use of midframe sampling timer. This timer
				samples the GPU powerstats if the cmdbatch expiry takes longer than
				the threshold set by KGSL_GOVERNOR_CALL_INTERVAL. Enable only if
				target has NAP state enabled.
 nvmem-cells:
				A phandle to the configuration data such as gpu speed bin, gpu gaming mode
				provided by a nvmem device. If unspecified default values shall be used.
 nvmem-cell-names:
				Should be "speed_bin", "gaming_bin"

GPU Quirks:
- qcom,gpu-quirk-two-pass-use-wfi:
				Signal the GPU to set Set TWOPASSUSEWFI bit in
				PC_DBG_ECO_CNTL (5XX and 6XX only)
- qcom,gpu-quirk-critical-packets:
				Submit a set of critical PM4 packets when the GPU wakes up
- qcom,gpu-quirk-fault-detect-mask:
				Mask out RB1-3 activity signals from HW hang
				detection logic
- qcom,gpu-quirk-dp2clockgating-disable:
				Disable RB sampler data path clock gating optimization
- qcom,gpu-quirk-lmloadkill-disable:
				Use register setting to disable local memory(LM) feature
				to avoid corner case error
- qcom,gpu-quirk-hfi-use-reg:
				Use registers to replace DCVS HFI message to avoid GMU failure
				to access system memory during IFPC
- qcom,gpu-quirk-limit-uche-gbif-rw:
				Limit number of read and write transactions from UCHE block to
				GBIF to avoid possible deadlock between GBIF, SMMU and MEMNOC.
- qcom,gpu-quirk-mmu-secure-cb-alt:
				Select alternate secure context bank to generate SID1 for
				secure playback.

KGSL Memory Pools:
- qcom,gpu-mempools:		Container for sets of GPU mempools.Multiple sets
				(pools) can be defined within qcom,gpu-mempools.
				Each mempool defines a pool order, reserved pages,
				allocation allowed.
Properties:
- compatible:			Should be qcom,gpu-mempools or qcom,gpu-mempools-lowmem.
- qcom,mempool-max-pages:	Max pages for all mempools, If not defined there is no limit.
- qcom,gpu-mempool:		Defines a set of mempools.

Properties:
- reg:				Index of the pool (0 = lowest pool order).
- qcom,mempool-page-size:	Size of page.
- qcom,mempool-reserved:	Number of pages reserved at init time for a pool.
- qcom,mempool-allocate:	Allocate memory from the system memory when the
				reserved pool exhausted.
- qcom,mempool-max-pages:	Limit on max pages this pool can hold, If not defined
				there is no limit.
GPU CX Ipeak:
- qcom,gpu-cx-ipeak:		Container for GPU CX ipeak clients. Multiple clients
				can be defined within qcom,gpu-cx-ipeak. Each client
				specifies the data required by CX Ipeak driver for
				registration and frequency value for which this client
				will be used.
Properties:
- compatible:			Must be qcom,gpu-cx-ipeak.
- qcom,gpu-cx-ipeak:		Defines a CX Ipeak client.

Properties:
- qcom,gpu-cx-ipeak:
				CX Ipeak is a mitigation scheme which throttles cDSP frequency
				if all the clients are running at their respective threshold
				frequencies to limit CX peak current.
				<phandle bit>
				phandle - phandle of CX Ipeak device node
				bit     - Every bit corresponds to a client of CX Ipeak
				driver in the relevant register.
- qcom,gpu-cx-ipeak-freq:
				GPU frequency threshold for CX Ipeak voting. GPU votes
				to CX Ipeak driver when GPU clock crosses this threshold.
				CX Ipeak can limit peak current based on voting from other client.

SOC Hardware revisions:
- qcom,soc-hw-revisions:
		Container of sets of SOC hardware revisions specified by
		qcom,soc-hw-revision.
Properties:
- compatible:
		Must be qcom,soc-hw-revisions.

- qcom,soc-hw-revision:
		Defines a SOC hardware revision.

Properties:
-  qcom,soc-hw-revision:
		Identifier for the hardware revision - must match the value read
		from the hardware.
- qcom,chipid:
		GPU Chip ID to be used for this hardware revision.
- qcom,gpu-quirk-*:
		GPU quirks applicable for this hardware revision.

GPU LLC slice info:
- cache-slice-names:		List of LLC cache slices for GPU transactions
				and pagetable walk.
- cache-slices:			phandle to the system LLC driver, cache slice index.

L3 Power levels:
- qcom,l3-pwrlevels:		Container for sets of L3 power levels, the
				L3 frequency is adjusted according to the
				performance hint received from userspace.

Properties:
- compatible:			Must be qcom,l3-pwrlevels
- qcom,l3-pwrlevel:		A single L3 powerlevel

Properties:
- reg:				Index of the L3 powerlevel
				0 = powerlevel for no L3 vote
				1 = powerlevel for medium L3 vote
				2 = powerlevel for maximum L3 vote
- qcom,l3-freq:			The L3 frequency for the powerlevel (in Hz)

GPU coresight info:
The following properties are optional as collecting data via coresight might
not be supported for every chipset. The documentation for coresight
properties can be found in:
Documentation/devicetree/bindings/coresight/coresight.txt

- qcom,gpu-coresights:	 Container for sets of GPU coresight sources.
- coresight-id:          Unique integer identifier for the bus.
- coresight-name:        Unique descriptive name of the bus.
- coresight-nr-inports:  Number of input ports on the bus.
- coresight-outports:    List of output port numbers on the bus.
- coresight-child-list:  List of phandles pointing to the children of this
                         component.
- coresight-child-ports: List of input port numbers of the children.
- coresight-atid:        The unique ATID value of the coresight device

Example of A330 GPU in MSM8916:

&soc {
	msm_gpu: qcom,kgsl-3d0@1c00000 {
		label = "kgsl-3d0";
		compatible = "qcom,kgsl-3d0", "qcom,kgsl-3d";
		reg = <0x1c00000 0x10000
		       0x1c20000 0x20000>;
		reg-names = "kgsl_3d0_reg_memory" , "kgsl_3d0_shader_memory";
		interrupts = <0 33 0>;
		interrupt-names = "kgsl_3d0_irq";
		qcom,id = <0>;

		qcom,chipid = <0x03000600>;

		qcom,initial-pwrlevel = <1>;

		/* Idle Timeout = HZ/12 */
		qcom,idle-timeout = <8>;
		qcom,strtstp-sleepwake;

		clocks = <&clock_gcc clk_gcc_oxili_gfx3d_clk>,
			<&clock_gcc clk_gcc_oxili_ahb_clk>,
			<&clock_gcc clk_gcc_oxili_gmem_clk>,
			<&clock_gcc clk_gcc_bimc_gfx_clk>,
			<&clock_gcc clk_gcc_bimc_gpu_clk>;
		clock-names = "core_clk", "iface_clk", "mem_clk",
				"mem_iface_clk", "alt_mem_iface_clk";

		/* Bus Scale Settings */
		qcom, gpu-bus-table {
			compatible="qcom,gpu-bus-table","qcom,gpu-bus-table-ddr7";
			qcom,msm-bus,name = "grp3d";
			qcom,msm-bus,num-cases = <4>;
			qcom,msm-bus,num-paths = <1>;
			qcom,msm-bus,vectors-KBps =
				<26 512 0 0>,
				<26 512 0 1600000>,
				<26 512 0 3200000>,
				<26 512 0 4264000>;
		};

		/* GDSC oxili regulators */
		vdd-supply = <&gdsc_oxili_gx>;

		nvmem-cells = <&gpu_speed_bin>, <&gpu_gaming_bin>;
		nvmem-cell-names = "speed_bin", "gaming_bin";

		/* IOMMU Data */
		iommu = <&gfx_iommu>;

		/* Trace bus */
		coresight-id = <67>;
		coresight-name = "coresight-gfx";
		coresight-nr-inports = <0>;
		coresight-outports = <0>;
		coresight-child-list = <&funnel_in0>;
		coresight-child-ports = <5>;

		/* Enable context aware freq. scaling */
		qcom,enable-ca-jump;

		/* Context aware jump busy penalty in us */
		qcom,ca-busy-penalty = <12000>;

		/* Context aware jump target power level */
		qcom,ca-target-pwrlevel = <1>;

		qcom,gpu-cx-ipeak {
			#address-cells = <1>;
			#size-cells = <0>;
			compatible = "qcom,gpu-cx-ipeak";

			qcom,gpu-cx-ipeak@0 {
				qcom,gpu-cx-ipeak = <&cx_ipeak_lm 10>;
				qcom,gpu-cx-ipeak-freq = <980000000>;
			};

			qcom,gpu-cx-ipeak@1 {
				qcom,gpu-cx-ipeak = <&cx_ipeak_lm 1>;
				qcom,gpu-cx-ipeak-freq = <900000000>;
			};
		};

		qcom,soc-hw-revisions {
			#address-cells = <1>;
			#size-cells = <0>;

			compatible="qcom,soc-hw-revisions";

			qcom,soc-hw-revision@0 {
				reg = <0>;

				qcom,chipid = <0x06010500>;
				qcom,gpu-quirk-hfi-use-reg;
				qcom,gpu-quirk-limit-uche-gbif-rw;
			};

			qcom,soc-hw-revision@1 {
				reg = <1>;

				qcom,chipid = <0x06010501>;
				qcom,gpu-quirk-hfi-use-reg;
			};
		};

		/* GPU Mempools */
		qcom,gpu-mempools {
			#address-cells= <1>;
			#size-cells = <0>;
			compatible = "qcom,gpu-mempools";

			/* 4K Page Pool configuration */
			qcom,gpu-mempool@0 {
				reg = <0>;
				qcom,mempool-page-size = <4096>;
				qcom,mempool-reserved = <2048>;
				qcom,mempool-allocate;
			};
			/* 8K Page Pool configuration */
			qcom,gpu-mempool@1 {
				reg = <1>;
				qcom,mempool-page-size  = <8192>;
				qcom,mempool-reserved = <1024>;
				qcom,mempool-allocate;
			};
			/* 64K Page Pool configuration */
			qcom,gpu-mempool@2 {
				reg = <2>;
				qcom,mempool-page-size  = <65536>;
				qcom,mempool-reserved = <256>;
			};
			/* 1M Page Pool configuration */
			qcom,gpu-mempool@3 {
				reg = <3>;
				qcom,mempool-page-size  = <1048576>;
				qcom,mempool-reserved = <32>;
			};
		};

		/* Power levels */
		qcom,gpu-pwrlevels-bins {
			#address-cells = <1>;
			#size-cells = <0>;

			qcom,gpu-pwrlevels-0 {
				#address-cells = <1>;
				#size-cells = <0>;

				qcom,speed-bin = <0>;
				qcom,ca-target-pwrlevel = <1>;

				qcom,gpu-pwrlevel@0 {
					reg = <0>;
					qcom,gpu-freq = <400000000>;
					qcom,bus-freq = <3>;
					qcom,io-fraction = <33>;
				};

				qcom,gpu-pwrlevel@1 {
					reg = <1>;
					qcom,gpu-freq = <310000000>;
					qcom,bus-freq = <2>;
					qcom,io-fraction = <66>;
				};

				qcom,gpu-pwrlevel@2 {
					reg = <2>;
					qcom,gpu-freq = <200000000>;
					qcom,bus-freq = <1>;
					qcom,io-fraction = <100>;
				};

				qcom,gpu-pwrlevel@3 {
					reg = <3>;
					qcom,gpu-freq = <27000000>;
					qcom,bus-freq = <0>;
					qcom,io-fraction = <0>;
				};
			};
		};

	};
};
